Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
The preparation and characterization of nano-sized Pt-Pd/C catalysts and comparison of their superior catalytic activities for methanol and ethanol oxidation
Date
2012-12-01
Author
Ozturk, Zafer
Sen, Fatih
Sen, Selda
Gökağaç Arslan, Gülsün
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
192
views
0
downloads
Cite This
In this study, two groups of carbon supported PtPd samples with different percentages of metals were prepared to examine the effects of Pd and stabilizing agents on the catalytic activity towards methanol and ethanol oxidation reactions. As a stabilizing agent, 1-hexanethiol and 1,1-dimethyl hexanethiol were used for group "a" and "b" catalysts, respectively. Cyclic voltammetry, chronoamperometry, X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy (XPS) were employed to understand the nature of the prepared catalysts. TEM and XRD results indicated a similar size distribution of the metal nanoparticles with a narrow average crystallite size of 3.0-3.7 nm. XPS data revealed the presence of two different oxidation states for both platinum and palladium, being Pt(0), Pt(IV), Pd(0), and Pd(II). Electrochemical studies indicated that the group "b" type catalysts have a higher catalytic activity than group "a". The most active catalyst was found to be a carbon supported 88 %Pt/12 %Pd prepared with 1,1-dimethyl hexanethiol, which has an activity of similar to 5 times (similar to 0.450 A/mg Pt at 0.57 V for methanol) and similar to 14 times (similar to 0.350 A/g Pt at 0.56 V for ethanol) greater than the commercial E-TEK catalyst.
Subject Keywords
Alcohol fuel-cells
,
Platinum nanoparticles
,
Gold nanoparticles
,
Tert-octanethiol
,
Anode catalysts
,
Co oxidation
,
Electrocatalysts
,
Carbon
,
Electrooxidation
,
Surfactant
URI
https://hdl.handle.net/11511/35653
Journal
JOURNAL OF MATERIALS SCIENCE
DOI
https://doi.org/10.1007/s10853-012-6709-3
Collections
Department of Chemistry, Article
Suggestions
OpenMETU
Core
Investigation of glucose electrooxidation mechanism over N-modified metal-doped graphene electrode by density functional theory approach
Duzenli, Derya; Önal, Işık; Tezsevin, Ilker (2022-10-01)
In this work, various precious and non-precious metals reported in the literature as the most effective catalysts for glucose electrooxidation reaction were investigated by the density functional theory (DFT) approach in order to reveal the mechanisms taking place over the catalysts in the fuel cell. The use of a single-atom catalyst model was adopted by insertion of one Au, Cu, Ni, Pd, Pt, and Zn metal atom on the pyridinic N atoms doped graphene surface (NG). beta form of d-glucose in alkaline solution wa...
On the Structure Sensitivity of CO Oxidation on Alumina Supported Pd-Pt Bimetallic Catalysts
Kaya, Sarp; Erunal, Ebru; Shaltaf, Riad; Ellialtıoğlu, Süleyman Şinasi; Üner, Deniz (2009-01-01)
CO oxidation reaction was studied over monometallic and bimetallic palladium-platinum catalysts at 25:75, 50:50, and 75:25 Pd:Pt atomic fractions co-impregnated over a gamma-Al2O3 support. The size of the metal particles, measured by modified hydrogen chemisorption, increased as the Pd fractions in the catalyst increased. The surface compositions and site metal distributions of the catalysts determined from Monte Carlo simulations indicated that Pd atoms segregated to the surface: at low Pd levels, Pd occup...
The preparation and characterization of gold(0) nanoclusters stabilized by zeolite framework: Highly active, selective and reusable catalyst in aerobic oxidation of benzyl alcohol
Zahmakiran, Mehmet; Özkar, Saim (2010-05-15)
Zeolite framework stabilized gold(0) nanoclusters were prepared by the ion-exchange/impregnation of Au3+ ions with zeolite-Y followed by reduction of the Au3+ ions using sodium borohydride in aqueous solution, all at 50 degrees C. The zeolite framework stabilized gold(0) nanoclusters were isolated as red powder and characterized by HR-TEM, TEM, TEM-EDX, XRD, XPS, DR-UV-vis, SEM, ICP-OES spectroscopic methods and N-2-adsorption technique. This new material was found to be highly active, selective and reusabl...
An investigation of the microstructural and mechanical properties of tri-calcium phosphates doped with aluminum and fluoride ions
Tahmasebifar, Aydin; Evis, Zafer; Department of Engineering Sciences (2011)
The aim of this study was to investigate the microstructure and mechanical properties of pure tricalcium phosphate (TCP) and tricalcium phosphates doped with aluminum (Al3+) and fluoride (F-) ions at different compositions. TCP was synthesized via precipitation method and sintered at 1100C for 1 and 5 h. It was observed that density and relative density of the sintered materials were decreased by extending the sintering time. Increased densities were achieved upon Al3+ and/or F- doping. For structural anal...
The effect of H2:N2ratio on the NH3synthesis rate and on process economics over the Co3Mo3N catalyst
Hargreaves, Justin S.J.; Aslan, Melis; Üner, Deniz (2021-02-01)
In this study, the process economics of ammonia synthesis over Co3Mo3N was investigated by searching for an optimum feed stoichiometry. From ammonia synthesis rate measurements at atmospheric pressure and 400 °C over Co3Mo3N, it was found that the rate was independent of H2: N2 stoichiometry for stoichiometries above 0.5: 1. For H2: N2 stoichiometries below 0.5: 1, there was a linear dependency of ammonia synthesis rate on the H2: N2 stoichiometry. Static measurements of hydrogen adsorption isotherms at 25,...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
Z. Ozturk, F. Sen, S. Sen, and G. Gökağaç Arslan, “The preparation and characterization of nano-sized Pt-Pd/C catalysts and comparison of their superior catalytic activities for methanol and ethanol oxidation,”
JOURNAL OF MATERIALS SCIENCE
, pp. 8134–8144, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35653.